Exander scott



UNITED STATES PATENT OF ICE.

JAMES H. ELLIS, ALEXANDER SCOTT, AND ELI S. EDMONDSON, OF

GODERIUH, ONTARIO, CANADA.

CHO'P-CONVEYER FOR MILLSTONES.

SPECIFICATION forming part of Letters Patent-N0. 224,410, dated February 10, 1880.

Application filed May 28, 1879.

To all whom it may concern:

Be it known that we, JAMES H. ELLIs, AL- EXANDER Soorr, and ELI S. EDMoNnsoN, of Goderich, in the Province of Ontarioand Dominion of Canada, have invented a new and Improved Ohop-Gonveyer for Millstones, of which the following is a specification.

The object of our invention is to grind grain without heating, to effect the removal of the chop without detention, and to remove the heated air from within the curb by a passage separate from the chop-delivery.

Our invention consists in a spiral conveyer fitted to revolve in a channel around the bedstone and below the level of the grindingsurfaces, which conveyer carries the chop to a discharge-spout also, in the construction and manner of operating the conveyer.

The construction and operation will be more zotparticularly described in connection with the accompanying drawings, wherein Figure 1 is a top view of a grinding-mill fitted in accordance with our invention, the upper or running stone and curb being re- 2 5 moved. Fig. 2' is a vertical section on line a; w

of Fig. 1-. Fig. 3 is a detail view.

Similar letters of reference indicate corresponding parts. 1

A is the husk-frame; B, the bed-stone; O, the

spindle, and D the curb surrounding the upper and running stone, which latter is not shown. These parts are of'usual character,

' except as hereinafter mentioned.

In the frame A, around the stone B,is a

3 5 continuous channel or passage, a, which com-V municates at one side with a de1ivery-spout,b. This channel a is below the upper surface of the stone B, and is covered around its outer edge by an annular plate or ring, 0, on which 40 the curb D rests, leaving the upper part of the channel a open between the curb andstone, so thatthe ground material from be tween the stones drops freely into the channel. Within the channel a is fitted the spiral 5 conveyer d, which is shown as made in two separate semicircular portions, terminating at one end adjacent to the delivery-spout b, and with the ends at the opposite side of the stone connected to separate spindles e e, that are fitted in boxes f f and carry bevel-gears g g. Upon that side of frame A is fitted a vertical shaft, h, upon the vupper end of which is a bevel-gear, i, that meshes with gears g.

The shaft h is driven by a belt, it, from spindleO, and thereby imparts simultaneous revolution to the conveyers d. The conveyers d consist of fiat or round spring-wire coiled spirally and bent into semicircular form, which construction renders the conveyers flexible and capable of operating in the circular chan- 6o nel.

Upon the inner side of the curb D inclined flangesl are attached, which project contiguous 'to the side of the running stone, and while there is space for air between the curb and upper stone these flanges act as stops to the current of warm air caused by the running stone, and compel the discharge of the same i by the spout m through an opening in the ring 0. By this separate discharge of the aircurrent the danger of fire and explosions by sparks communicating withthe fine dust is avoided, as such dust is carried away by the current as fast as formed, and fresh cool air continually supplied. 7 5

The stops Z are to be made of leather or other suitable material, and are inclined in a direction contrary to that in which the stone 7 runs.

The stop-flanges I extend to within a short distance from the lower edge of the curb, with the exception of that one next the spout m, which extends nearly or quite to the bottom, and compels the discharge of the current by the spout m.

n 'n are braces for steadying the bed-stone and retaining the conveyers in place.

By the above -described construction the mill will grind cold without waste and without sweating. No artificialexhaust is required, 0 and the stones are run with open back. The chop is delivered freely from between the grindin g-surfaces and discharged rapidly without accumulation in the curb. The bed-stone may be applied and fitted in the same manner 5 to a floor when a husk-frame is not used.

We are aware that a spiral conveyer has been used for conveying the unthrashed heads of grain from the fan back to the thrasher of a grain-separator; but

What we claim, and desire to secure by Letters Patent, is

IOO

1. An improved grinding-mill in which a provided with the delivery-spout b, the bevel- 1o spiral conveyer is fitted in an annular channel wheel i, shaft h, belt 70, and spindle G, substanaround the bed-stone below the top surface of tially as and for the purpose set forth. the same, and rotated by bevel-gearing driven JAMES HOWARD ELLIS.

5 from the mill-spindle, substantially as and for ALEXANDER SCOTT.

the purpose set forth. ELI SMITH EDMONDSON.

2. The spiral conveyer 01, made in two semi- Witnesses: circular portions and provided with bevel- B. L. DOYLE,

wheels 0, in combination with the channel a, DONALD MGKAY. 

